Refrigeration evaporation



Oct. 17, 1933. D. SANDFORD 1,930,491

REFRIGERAT ION EVAPORATION Filed May 21, 1930 Patented Oct. 17, 1933 UNITED STATES PATENT OFFICE 1,930,491 REFRIGERATION EVAPORATION mm Sandford, Toledo, Ohio I Application May 21, 1930. Serial No. 454,267 2 Claims. (01. 62-9 5 This invention relates to features of evaporation in refrigerating installations.

This invention has utility when incorporated in brine jackets for the cooling medium ducts in mechanical refrigeration apparatus, say for institutions and retail establishments wherein the cooling occurs for display counters, etc.

Referring to the drawing: Fig. 1 is a diagrammatic showing of an embodiment of the invention in a mechanical refrigeration unit or installation;

Fig. 2 is an enlarged detail view of a longitudinal section, parts being broken away, of the evaporator of Fig. 1;

Fig. 3 is a section on the line III-m, Fig. 2; and

Fig. 4 is a side elevation, parts being broken away, of an evaporator unit having its inlet and outlet on the same end. In the mechanical refrigeration installation herein, compressor 1 is effective past check valve 2 for creating flow of medium as ammonia through duct 3 to condenser coil 4 from whence the medium as under pressure may flow by duct 5 past reducing valve 8 into cooling medium duct 7 in region or chamber 8 to be controlled as to its temperature.

This installation is shown as providing a closed circuit for this cooling medium as ammonia with so the duct '1 in communication past check valve 9 to the compressor 1. Herein, this cooling medium duct has welds 10 anchoring thereon fins 11 herein shown as of metal. Additionally and of larger diameter than these disks or fins 11 are as heads 12, 13, also connected by welds 10 in tight sealing relation with the duct '1, precluding the necessity of gaskets or glands. These heads 12, 13, are shown of slightly larger diameter than the disks 11. Enveloping shield 14 as a sleeve has clearance 15 relatively to the disks 11 and thus provides jacket chamber 16. Additionally, to the clearance 15 communication along the duct '1 is permitted through ports or openings 1'1 in the disks 11. There is accordingly provided herein this chamber 18, say as a brine chamber,

with perforate fins or disks therein.

In practice, port 18 may be provided at a convenient location and the jacket chamber 6 charged with the evaporation or transmission so material say brine. Thereafter'plug 19 may be sealed therelnto and the installation as thus closed up is a hermetically sealed unit independently of any stuifing boxes or glands. There is no occasion for re-charging. There is accordingly, insofar as this evaporation installation, no occasion for replenishment or upkeep attention in any way whatsoever. The charging of the jacket" is approximately to fully loaded condition, but entrained gases or'general conditions of the unit do not result in deformation due to temperature change and expansion or con- 66 traction of the brine or liquid material used as the agent in the evaporator for conducting the lowered or different temperature from the medium in the duct 7 through the wall 14.

When-it is desired to provide an extremely 70 low temperature unit providing a sustained cold condition, a unit is provided having inlet and discharge at the same end and an additional gas expansion within the evaporator. The duct '1 enters the housing 14 to extend to just short of reaching to the end 13, which is, in this instance, irnperforate. A second duct 7' having plug 21 welded into the end thereof, is provided and surrounds the duct '7 for conducting the ammonia or refrigerant as expanded thereinto out of the housing 14 at the same end as it entered and thence to valve 9. The double length travel of the refrigerant in the housing 14 plusthe additional expansion from the duct 7 intothe duct '7' provide an intensified and concentrated heat exchange area.

The fins 11 in this latter construction are welded to the duct 7'. This type .of unit is also used in installations wherein space is limited or the construction of the chamber 8 is such as to so render a one-way entrance more "practical.

What is claimed and it is desired to secure by Letters Patent is:

1. A refrigeration installation embodyt..g a duct for a cooling medium, said duct havin perforate disk fins integral therewith, and a jacket about and having clearance as to the fins providing a brine chamber about the duct.

2. A refrigeration installation embodying an evaporator having a refrigerant inlet duct and a refrigerant outlet duct surrounding the inlet duct and fixed relatively to each other and the evaporator, a sealed liquid 'Jacket about said ducts, and perforate ilns on said outlet duct 1 within said jacket.

' DENT SANDI'ORD. 

